See this feature request: Live team collaborative editing. I think there are some other threads where people discuss their current setups in trying to accomplish this. But from what I remember, there used to be one issue where if two people were editing the same note simultaneously, it was possible for the changes made by one person to be pushed to the vault of the other, thus overwriting some of their most recent changes within that note.
The commercial license doesn’t enable any new functionality — it’s just a license. There are various options for collaboration, but real-time collaboration on the same file like Google Docs isn’t possible now.
This is true, but its conflict resolution sometimes produces funky results. I try to avoid letting it happen when I’m switching between devices by myself and wouldn’t feel comfortable relying on it for live collaboration.